Cranberry Lake Aquatic Plant Survey 2012

Transcription

1 Cranberry Lake Aquatic Plant Survey 2012 Map 32: Location of Cranberry Lake. Cranberry Lake is located in the town of Clifton in St. Lawrence County, New York (Map 32). The 6995 acre lake was accessed by two access points, a hardtop DEC boat launch on the northern shore and a canoe launch out of Wanakena at the SUNY-ESF Ranger School. The DEC launch is found just off from State route 3 just west of Silver Lake. An aquatic plant survey of Cranberry Lake was conducted on 09-August Twoleaf or Variable-leaf watermilfoil (Myriophyllum heterophyllum) was detected during this survey (Map 35). The range in which this plant is deemed native or non-native is under debate and in some states this plant is classified as invasive. Aquatic plant coverage in Cranberry Lake was moderate, comprised of 74 plant beds that collectively covered 558 acres or 8% of the surface area of the lake (Map 33). Twenty-four different aquatic species were identified during this survey. Common species of this water body included many members of the pondweed genus Potamogeton, of which the most common was Ribbon leaf (P. epihydris), and Bur-reed (Sparganium sp.). Purple bladderwort (Utricularia purprea), Flatleaf bladderwort (U. intermedia), Lesser bladderwort (U. minor), and Common bladderwort (U. vulgaris) were the species detected which could be easily confused with invasive species (Table 22). Of the 213 rake tosses spaced throughout the littoral zone of the lake (Map 34), 54 rakes had acquired plants upon recovery (25%). All plants found on the rakes after their retrieval were detected during the surface survey (Table 23). Variable-leaf watermilfoil in Cranberry Lake was found in 38 beds which covered 386 acres. This was 5.5% of the surface area of the Lake and 69.2% of the total aquatic plant coverage in the lake (Map 35 & Table 24). 67

2 Map 33A: Location of the aquatic plant beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for Plant Beds can be found on Table

3 Map 33B: Location of the aquatic plant beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for Plant Beds can be found on Table

4 Map 33C: Location of the aquatic plant beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for Plant Beds can be found on Table

5 Map 34A. Rake toss locations on Cranberry Lake, 09 Aug, Open circles represent locations where no plants were detected, closed circles represent locations where plants were encountered on the rake. Data for Rake Tosses can be found on Table

6 Map 34B: Rake toss locations on Cranberry Lake, 09 Aug, Open circles represent locations where no plants were detected, closed circles represent locations where plants were encountered on the rake. Data for Rake Tosses can be found on Table

7 Map 34C: Rake toss locations on Cranberry Lake, 09 Aug, Open circles represent locations where no plants were detected, closed circles represent locations where plants were encountered on the rake. Data for Rake Tosses can be found on Table

8 Map 35A: Location of Myriophyllum heterophyllum beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for M. heterophyllum beds can be found on Table

9 Map 35B: Location of Myriophyllum heterophyllum beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for M. heterophyllum beds can be found on Table

10 Map 35C: Location of Myriophyllum heterophyllum beds detected in Cranberry Lake during the surface survey performed on 09 Aug, Data for M. heterophyllum beds can be found on Table

11 Table 22: Percent cover of aquatic plant species detected at each plant bed in Cranberry Lake. Refer to Map 33 series for bed locations. A = Abundant (<50% cover), C = Common (25-50%), P = Present (15-25%), O = Occasional (5-15%), and R = Rare (<5%). Cranberry Lake Plant Bed Numbers Scientific Name Common Name AREA (M 2 ) Brasenia schreberi Water shield R C O P R O O O - P P P C - P P P P - P O P R A C Eleocharis sp. Hairgrass O - P Elodea nuttalia Western waterweed R R Eriocaulon sp. Pipewort R - - O Lobelia dortmanna Water lobelia R Myriophyllum heterophyllum Twoleaf watermilfoil - - P - P O P O - R - - A - - O R P C Najas sp. Water naiad - - R - R R - R R O R - R - - R - - R R - Nitella sp. Brittlewort - - R O R R O R - Nuphar variegata Spatterdock P R R R R R R - - R - - R - R R R - - O R O O O O Nymphaea odorata White waterlily - - R R R R - R R R - Potamogeton amplifolius Large-leaf pondweed - - R R O R R - - R - - O C - R R - - Potamogeton epihydrus Ribbon-leaf pondweed - O O R R - - R R R R - O R O R O - O R - R O R - Potamogeton natans Floating pondweed R Potamogeton pusillus Small pondweed - - R O - R R R Potamogeton robbinsii Robbins pondweed Potamogeton spirillus Spiral-fruit pondweed R R Potamogeton zosterformis Flatstem pondweed R Sagittaria graminea Grassy arrowhead - R R R R Sparganium sp. Bur-reed R R R R R R O R P R R R O O R - A A P A O O O R C Utricularia intermedia Flatleaf bladderwort R R R - Utricularia minor Lesser bladderwort Utricularia purprea Purple bladderwort - - R R C R - O R R R - - R R O Utricularia vulgaris Common bladderwort - - R R O R - R - - P - - R - - R O - Vallisneria americana Eel-grass - - R Plant Bed Numbers Scientific Name Common Name AREA (M 2 ) Brasenia schreberi Water shield C R A A C C A A C A A A C C A C O C C - C C A A P Eleocharis sp. Hairgrass O O - R P O - C Elodea nuttalia Western waterweed Eriocaulon sp. Pipewort O O - Lobelia dortmanna Water lobelia Myriophyllum heterophyllum Twoleaf watermilfoil P C P P P R - R A O - O - - Najas sp. Water naiad O C R R R C - P C C P P O P C Nitella sp. Brittlewort R R Nuphar variegata Spatterdock O R O O R R R R R O - O O - - O - P O P O O Nymphaea odorata White waterlily O R Potamogeton amplifolius Large-leaf pondweed - - O P P O Potamogeton epihydrus Ribbon-leaf pondweed R R - R O - R P - - R O O - R - R O - R R Potamogeton natans Floating pondweed R - O Potamogeton pusillus Small pondweed - O O P O C - - O Potamogeton robbinsii Robbins pondweed R Potamogeton spirillus Spiral-fruit pondweed - C P - R R O R R R R R - - Potamogeton zosterformis Flatstem pondweed - A R R - - P - R R - R - R Sagittaria graminea Grassy arrowhead Sparganium sp. Bur-reed O O R O R P R - - R C P P C R O - C P - C C C C P Utricularia intermedia Flatleaf bladderwort R R - R R - - R - R - - R R Utricularia minor Lesser bladderwort Utricularia purprea Purple bladderwort P P R C - R R P - O - R Utricularia vulgaris Common bladderwort R - O - O O Vallisneria americana Eel-grass R R R R

12 Plant Scientific Name Common Name AREA (M 2 ) Brasenia schreberi Water shield A A C C A A O R - R P A P P C R Eleocharis sp. Hairgrass R R C Elodea nuttalia Western waterweed Eriocaulon sp. Pipewort Lobelia dortmanna Water lobelia Myriophyllum heterophyllum Twoleaf watermilfoil R C P O R - P P C - R A A A A A P O P - Najas sp. Water naiad - - A P P C A R R O - P A A A - Nitella sp. Brittlewort R R - - Nuphar variegata Spatterdock R R P R O O R - - O - - O R O O R - Nymphaea odorata White waterlily O Potamogeton amplifolius Large-leaf pondweed R O Potamogeton epihydrus Ribbon-leaf pondweed - - O O R - O P P O R O O O O O C C P P Potamogeton natans Floating pondweed Potamogeton pusillus Small pondweed P R Potamogeton robbinsii Robbins pondweed R Potamogeton spirillus Spiral-fruit pondweed R - R P - Potamogeton zosterformis Flatstem pondweed - O O - - O Sagittaria graminea Grassy arrowhead O - R R - - P Sparganium sp. Bur-reed C P P O P - R P C - O O R P P R R R - - Utricularia intermedia Flatleaf bladderwort - - O P R - - Utricularia minor Lesser bladderwort R R Utricularia purprea Purple bladderwort O - - R - - C R - - R Utricularia vulgaris Common bladderwort - R O - O R - P O O Vallisneria americana Eel-grass R

13 Table 23: Species present on the rake at each of the rake toss locations and abundance. Refer to Map 34 series for Rake locations. Cranberry Lake Rake Toss Numbers Scientific Name Common Name Brasenia schreberi Water shield Eleocharis sp. Hairgrass O R R R - R Elodea nuttalia Western waterweed Eriocaulon sp. Pipewort R Myriophyllum heterophyllum Twoleaf watermilfoil - C - R C O Najas sp. Water naiad Nitella sp. Brittlewort - - R R A O O - R - - O - - R O R R R R R - - R Potamogeton epihydrus Ribbon-leaf pondweed Potamogeton gramineus Variable-leaf pondweed - O O - R R Potamogeton pusillus Small pondweed R Potamogeton spirillus Spiral-fruit pondweed Potamogeton zosterformis Flatstem pondweed R P Sagittaria graminea Grassy arrowhead Sparganium sp. Bur-reed R - Utricularia intermedia Flatleaf bladderwort O Utricularia minor Lesser bladderwort Utricularia purprea Purple bladderwort R O R - - O Utricularia vulgaris Common bladderwort R - O R Rake Toss Numbers Scientific Name Common Name Brasenia schreberi Water shield R Eleocharis sp. Hairgrass R Elodea nuttalia Western waterweed R R Eriocaulon sp. Pipewort Myriophyllum heterophyllum Twoleaf watermilfoil Najas sp. Water naiad P R Nitella sp. Brittlewort - R O R R - - C - C A R R R R - R R - - Potamogeton epihydrus Ribbon-leaf pondweed - - R Potamogeton gramineus Variable-leaf pondweed O R Potamogeton pusillus Small pondweed P Potamogeton spirillus Spiral-fruit pondweed A - P P R Potamogeton zosterformis Flatstem pondweed Sagittaria graminea Grassy arrowhead R Sparganium sp. Bur-reed O R Utricularia intermedia Flatleaf bladderwort Utricularia minor Lesser bladderwort R Utricularia purprea Purple bladderwort R R C R O - - R Utricularia vulgaris Common bladderwort C O

14 Table 24: Percent cover of Myriophyllum heterophyllum detected at each plant bed in Cranberry Lake. Refer to Map 35 series for M. heterophyllum locations. A = Abundant (<50% cover), C = Common (25-50%), P = Present (15-25%), O = Occasional (5-15%), and R = Rare (<5%). Cranberry Lake Plant Bed Numbers Scientific Name Common Name AREA (M 2 ) Myriophyllum heterophyllum Twoleaf watermilfoil P P O P O R A O R P C P C P P P R R A Cranberry Lake Plant Bed Numbers Scientific Name Common Name AREA (M 2 ) Myriophyllum heterophyllum Twoleaf watermilfoil O O R C P O R P P C R A A A A A P O P 80